With few exceptions, however, their musculature remains scarcely described. Freestyle swimmers are known for their V-shaped torso – broad shoulders and narrow hips – physical proof that this stroke relies on extreme upper-body strength. Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a single pair of chelae (claws). The weakest of all muscle tissues, visceral muscle makes organs contract to move substances through the organ. Crabs are found in all of the world's oceans, while many crabs live in fresh water and on land, particularly in tropical regions. Basic Anatomy. The opener muscle (), responsible for abduction of the dactyl, originates on the dorsal half of the propodite segment and inserts on a single apodeme that is connected to the dorsal projection of the dactyl.In the first pereopod, this muscle is much reduced to accommodate the larger closer muscle. Fill in the anatomy of a crab using the numbers in the word bank. Most of the body is head and thorax which are covered dorsally by a large hard carapace. There are three types of muscle tissue: Visceral, cardiac, and skeletal. There are three divisions to the body of the horseshoe crab: the prosoma , the opisthosoma, and the telson. This worksheets introduces your child to a fascinating crustacean. Fill in the anatomy of a crab using the numbers in the word bank. Innervation of the muscles was studied using intracellular stimulating and recording techniques. 2) The movement of the leg is controlled by four sets of muscles composed of two, three, or four bundles each. We study the neuroethology of legged locomotion in the portly spider crab, Libinia emarginata (Brachyura, Majoidea), which preferentially walks … Legs. While there are some male and female muscle differences in terms of composition, muscle mass and proportion have a greater effect on strength and performance than gender. Download : Download full-size image Fig. By contracting that muscle the leg is severed at the joint losing the leg and saving the life. However, in relation to the blue crab, the lobster and other crabs, this claw is easier to crack and smaller in relation to body size. Front crawl – also called the freestyle or simply the free – is the fastest of the four competition strokes. If a crab is in a weakened state or is otherwise stressed it may be incapable of accomplishing this life saving feat and die from loss of blood. Decapod crustaceans have been the focus of neuroethological studies for decades. Dungeness crab (Cancer magister), named after a small town and the shallow bay inside of Dungeness Spit on the Olympic Peninsula in Washington State, is the culinary jewel of Netarts Bay, a prime destination for crabbers. These are sometimes referred to as the cephalothorax, the abdomen, and the tail. Muscular System Anatomy Muscle Types. Blue Crab Dissection External Anatomy Examine your crab and note that, unlike more primitive decapods such as shrimps and crayfish, the body is very wide and is dorsoventrally flattened. 2.Dorsal view of the distal musculature of the legs … There is a muscle attached to a valve sort of apparatus on the joint of each leg closest to the carapace. Visceral Muscle. Jan 19, 2013 - Don't be crabby! Examine the external anatomy of your specimen. 1) The anatomy and neurophysiology of muscles moving the fifth leg of Callinectes sapidus are described. The anatomy of king crab consists of shoulders merus legs claws joints tips. Jan 19, 2013 - Don't be crabby! The crustacean nervous system consists basically of a brain or supraesophageal ganglion connected to a ventral nerve cord of ganglia or nerve centres. This is where you'll find the largest muscle of the crab and therefore the largest section of meat. 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